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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4489b56a936606cb76128a4fe5666ea65bcd44a7208ee966ee74c4ee62c4d416' 
  AND token = '98SKXKS5SdqYOxBG2fwJxe1FaT2zDi6jL67Uw++m5eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}